Casting apparatus.



J. H. BAMBERG & H. H. DOEHLER.

CASTING APPARATUS.

APPLICATION FILED FEB I2, 1917.

Patented Apr. 29, I919.

2 SHEETSSHEET I- mmpaw 9 BY HAM/K i INV 1. H. BAMBERG & H'. H. DOEHL'ERQ CASTING APPARATUS. APPLICATION FILED FEB. 12. 1917.

Patented Apr. 29, 1919.

2 SHEETS-SHEET 2.

LSQLQQ5O BY (J WM IINVENTOR. WW w ATTORNEY,

UNITED STATES Parana OFFIKGE- JOSEPH H. BAMBERG, OF TOLEDO, OHIO, ANDHERMAN H. DOEHLEJBI, OF BROOKLYN, NEW YORK, ASSIGNORS TO DOEHLER DIE-CASTING COMPANY, OF BROOKLYN. NEW YORK,

A CORPORATION OF NEW YORK.

CASTING APPARATUS.

Specification of Letters Patent.

Patented Apr, 29, 31919.,

Application filed February 12, 1917. Serial No. 148,025.

To all whom it may concern:

Be it known that we, JOSEPH H. BAM- nnno and HERMAN H. DOEHLER, both citizens of the'United States, residing, respectively, at Toledo, county of Lucas, State of Ohio, and the borough of Brooklyn, city of New York, county of Kings, and State of New York, have jointly invented certain new and useful Improvements in Casting Apparatus, of which the following is a specification, reference being had therein to the accompanying drawings, which form a part thereof.

Our invention relates to casting apparatus and more particularly to apparatus of the character adapted for use in making hollow cylindrical or cup-like castings, having a deep chill at the outer surface thereof, and substantially no chill at the inner surface thereof, and having a gradual reduction in the hardness and density of the metal from one surface toward the other.

In apparatus of thecharacter to which our invention relates, it is necessary in addition to forming a mold cavity in conformity with the contour of the casting to be made, to provide'in addition to the inside core, supplemental outside cores for forming depressions, or openings in the outer surface of the casting which must be capable of such movements as willpermit their being quickly Withdrawn from the metal immediately following the initial solidification shrinkage to prevent the rupture or fracture of the casting about the core, and to permit the drawing of the casting from the mold cavity.

When the inner face of the casting is to be provided with projections, or depressions extending transversely of the axis of the casting, it is impossible to use a rigid core, and we have discovered that the strength of the casting not only may be materially increased by preventing heat radiation toward the inside core, but that this practice imparts other highly desirable characteristics to the casting which are referred to .in application for Letters Patent filed simultaneously herewith for such-a casting and of said cavity without spraying or being dithe method of making same, Serial No. to 148,026. v

The object of our present invention is to provide an apparatus especially adapted to produce castings made in accordance with the invention of our aforesaid application, which apparatus may be rapidly actuated, and the various cores of-which will always be positioned accurately with relation to the mold cavity so as to insure uniformity in all castings made. 7

It is also essential in apparatus of this character to control the metal flowing by gravity into the mold in a manner to permit the casting to build up from the bottom '85 vided in a manner to imprison air or gases in the body of the casting in a manner to form concealed blow holes.

The inside core used in the apparatus is formed of ordinary molding sand, or a plastic composition used for making molds, and the apparatus is so constructed as to facilitate the placing of this core with relation to the mold cavity in a manner to avoid the breaking of the core when closing the mold. s

The invention consists primarily in a casting apparatus composing a plurality of mold parts capable of relative movement, each of said parts having a portion of a mold cavity and of an ingate formed therein, a support for said mold parts, and means upon said support whereby a frangible inside core may be stationarily supported between said mold parts when the mold is open, and in such other novel features of construction and combination of parts as are hereinafter set forth and described and more particularly pointed out in the claims hereto appended.

Referring to the drawings,

Figure 1 is a plan view of a molding apparatus embodying our invention, the relation of the concealed portions thereof being shown in dotted lines;

Fig. 2 is a vertical section, partly shown in elevation, taken on line 2-2 of'Fig. 1; and

Fig, 3 is a transverse section on the line 3-8 of Fig. 1.

Like letters refer to like parts throughout the several views.

In the embodiment of the invention shown in the drawings, (1 indicates a support or base for the movable mold parts 22-0, said support and said mold parts being provided With cooperating means as the tongue and grooves a for guiding the movement of said mold parts in opening and closing the mold. The support a is also provided with an annular groove a to admit air under the mold parts and prevent suction interfering with the free sliding movement thereof.

Each of the mold parts bc has a part .of a mold cavity therein, or when two castings are formed in the same apparatus, two such portions of a mold cavity as a Zd spaced apart, and in alinement with-each other, a well as. 6 being formed between the adjacent open mouths of said cavities. The mold parts b0 are made of metal or other material having high heat conductivity. WVithin the well e and projecting beyond the edge of each mold cavity, is a metal plate f-f carried by. and movable with its mold part. The function of this plate is to support the core and form the end of the mold cavity.

Extending about the end of each of the mold cavities ald respectively is a semicircular depression forming together a supplemental ingate gg' leading into which respectively is an ingate b h disposed upon opposite sides of the line of parting of the mold parts to facilitate the drawing of the sprue These ingates are constricted toward the supplemental ingate to facilitate the separation of dross and insure only clean metal A entering the mold cavity. The ingates enter adjacent the top of the su plemental in? gates to permit the metal to build up from the bottom of the mold cavity.

Slidably mounted in suitable bearings -z'-c'"extending axially of the mold cavities nild, and formed of two halves carried by the sections bc respectively are metalcores jj provided with operating handles j -j respectively. These cores are accurately positioned by means of their enlarged heads j-j and the stop pins j -j which prevent their accidental displacement while the mold is being filled. Other movable cores for forming openings through the wall 'of the casting and slidably mounted in the mold parts b-c are shown at j j.

The mold parts 6-0 are adapted to be locked in the closed positions by means of the metal straps k-k' pivoted upon studs k 8 andv passing over similar studs k cams,

7cbeing carried by each of said straps,

with the finished casting.-

and acting upon the studs k"- 5 respecat v suitable plaster composition and is composed of that portion m-m about which the metal flows in pouring, and a portion a by means of which this core is supported by the support of base a. To insure accuracy in the positioning of the core, we provide the said support or base a with a conical opening a into which a conical projection 11, upon the portion n is adapted to enter. We also provide the base a with a stud a adapted to enter a recess n formed in the portion n which aids in accurately positioning said core and insures the proper axial alinement of the portions mm' and the mold cavities cZ-d. While this arrangement insures accuracy in the position of the core, it is also necessary to provide means whereby, as the mold is closed, the parts thereof will always have the same relation to the said core; We secure this result by providing the base a with straps a adapted to enter recesses in the face of each mold part.

The operation of the herein described apparatus is substantially as follows The mold parts b-c are first brought to a temperature which will prevent such a rapid chilling of the molten met 1 as will interfere with the proper filling f the mold cavity, and the formation of surface flaws thereon. The two parts b-0 are then separated and an inside core is deposited upon the support or base a between the said mold parts with the projection nW within the opening a and the stud a within the recess 11?. The

mold is then closed, the stops a bringing the vby gravity through the constricted outlet of the ingate into the supplemental ingates gg and from there into the mold cavity about the frangible core of ,heat insulat- [mg .or refractory material. As heretofore stated, the metal builds up from the bottom of the mold cavity and is not sprayed into the cavity, or divided, as it enters sald cavity. The head afforded by the constriction of the ingates lvh and the arrangement of the supplemental ingates g-g permits the separationof the dross from the metal and prevents the former entering the mold cavity.

After allowing only sufficieht time'for the initial solidification shrinkage, the various metal cores are drawn, and the mold is then allowed to remain closed fora suficient interval to secure the desired depth of chill in the casting before opening it and drawing the casting therefrom.

As the casting is drawn, the inside cores and the sprues are drawn with it, the former being later removed by breaking, and the latter by sawing, or chipping.

The operations above referred to may be repeated with a desirable rapidity, and as stated, two castings may readily be made with one cycle of operations of the molding apparatus. If desired, however, only one mold cavity may be formed.

By using an inside core of the character herein referredto, the interior of a hollow cylindrical, or cup-shaped casti may have any desired surface formations t hereon.

The entire outer surface of the casting is subjected to the desired rapid cooling actions, and thus radiationof heat from the metal can proceed only outwardly of the casting. The use of an. inside core formed, as described, of porous, refractory material will not only facilitate the venting of the mold cavity, but will permit the free shrinkage of the metal of the casting without offering such resistance as will formeither concealed or exposed cracks. Furthermore, warping of the casting while in the mold, or after it has been drawn, or is in use, is reduced to a minimum if not entirely avoided.

It is not our intention to limit the invention to the precise details of construction shown in the drawings, as it is apparent that such may be varied without departing from the spirit and scope of the invention.

Having described the invention, what we claim as new and desire to have protected by Letters Patent is 1. A casting apparatus comprising a pair of mold parts mounted for relative movement in a horizontal plane, each of said parts having a portion of a cylindrical mold cavity formed therein, a support for said mold parts, a frangible core having a portion adapted to seat upon said support and a portion adapted to extend at an angle thereto into said mold cavity, the first-named portion of said core having a downwardly extending projection fitting into a corresponding opening in said support, and said support having a vertical in adaptedto enter a recess in said core, w ereby said core .will

be accurately positioned with respect to the mold cavity when the mold is closed.

2. A casting apparatus comprising a pair of mold parts mounted for relative movement in a horizontal plane, each of said parts having a plurality of portions of alined, open ended cylindrical mold cavities formed therein, with a vertical well formed between the adjacent open ends of said cavities, a support for said mold parts, and a frangible core having a portion adapted to seat upon said support and extend upwardlyin said well, and alined portions adaptedto extend at right angles to said seating portion into said mold cavities, said support and core having cooperating means whereby said core will be accurately positioned with relation to the mold cavity when the mold is closed.

3. A casting apparatus comprising a plurality of mold parts mounted for relative movement in a horizontal plane, each of said parts having a plurality of portions of alined, open ended, separated horizontal cylindrical cavities formed therein, and portions of ingates leading into the outer ends of the mold cavities, formed therein, a support for said mold parts, and a frangible core having a portion adapted to seat upon said support adjacent the inner ends of said mold cavities, and portions adapted to extend at an angle therefrom into said mold cavities.

4. A casting apparatus embodying therein a plurality of mold parts capable of relative 'movement, each of said parts having a portion of a horizontal, cylindrical mold cavity and of an ingate, leading thereto, formed therein, metallic cores penetrating said mold cavity and movably mounted in said mold parts, a sup ort for said mold parts, and means whereby a frangible inside core may be stationarilysupported between said mold 7 parts when the mold is open.

5. A casting apparatus embodying therein a plurality of metallic mold parts capable of relative movement, each of said parts having a portion of a horizontal, cylindrical mold cavity and of an ingate formed therein, metallic cores penetrating said mold cavity and movably mounted in-said mold parts, a support for said mold parts, and a frangible core of refractory or heat insulating material having a portion adapted to seat upon said support and another portion thereof adapted to project into said mold cavity, whereby the metal forming the outer surface of the casting will be cast against surfaces having high heat conductivity and the metal forming the inner surface of the casting will be cast against refractory or heat insulating surfaces. 7

6. A casting apparatus comprising a pair of metallic mold parts mounted for relative movement in a horizontal plane, each of said parts having a portion of a horizontal cylindrical mold cavity and of an ingate, leading thereto, formed therein, metallic cores penetrating said mold cavity radially and movably mounted in said mold parts, a support for said mold parts, and means whereby a frangible inside core, adapted -to extend horizontally into the mold cavity, may be stationarily supported between said mold parts when the mold is open.

into the mold. cavity from the end opposite to that'in which said metallic core extends.

In witness whereof, we hereunto aflix our signatures in the presence of two subscribing witnesses, this 3rd day'ofFebruary 1917.

JOSEPH H. BAMBERG. HERMAN H. DOEHLER.

Witnesses:

J. A. TALLMAN, H. B. GRIFFIN. 

